(X - 240) x (1-25%)/(2000 + 250)=(X - 240 - 1000 x 10%) x (1 - 25%)/2000
    （x-1440）*（1-0.25）/5250=（X-1980）*（1-0.25）/4000
    x+(1÷x)^2
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=87.407
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=94.928
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.470
    12%=x*(1+3.7%)/10+3.7%
    12%=x*(1+3.7%)/10+3.7%
    12%=Xx(1+3.7%)/10+3.7%
    x^x＝7
    sin2x=0.6
    x+(2x-4)+(x-6)=20
    ln（1+x*x）
     x×(x+3)(x＾2+2x+2)=(x+2)((x+3)×(x＾2+2x+2)+x(x＾2+2x+2)+(x＾2+3x)(2x+2))
     x×(x+3)(x＾2+2x+2)=(x+2)((x+3)×(x＾2+2x+2)+x(x＾2+2x+2)+(x＾2+3x)(2x+2))
     x×(x+3)(x＾2+2x+2)=(x+2)(4x＾3+15x＾2+14x+6)
    3x＾4+18x＾3+36x＾2+28x+12=0
    13.1c=（3.3+c）×7.93
    566.7=510*n^6
    137.3=（（0.021*x^1.85+515.9）^0.5）*x^0.84

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